Power Management
PLX Technology, Inc.
Table 10-2. Supported PCI Express Power Management Capabilities (Cont.)
Register
Supported
Description
Offset
Bit(s)
Yes
No
Device Status and Control
Auxiliary (AUX) Power PM Enable
✔
✔
10
20
70h
Cleared to 0 for each port.
Auxiliary (AUX) Power Detected
Cleared to 0 for each port.
Link Capabilities
Active State Power Management (ASPM) Support
Indicates the level of ASPM supported by the port.
01b = L0s link power state entry is supported
10b = L0s and L1 link power states are supported
All other values are reserved.
✔
11:10
74h
L0s Exit Latency
✔
✔
14:12
17:15
101b = Corresponding PEX 8532 port L0s Exit Latency is between 1 and 2 µs
L1 Exit Latency
101b = Corresponding PEX 8532 port L1 Exit Latency is between 16 and 32 µs
Link Status and Control
Active State Power Management (ASPM) Control
00b = Disables L0s and L1 Entries for the corresponding PEX 8532 portc
01b = Enables only L0s Entry
78h
✔
1:0
10b = Enables only L1 Entry
11b = Enables both L0s and L1 Entries
Slot Capabilities (for Downstream Ports)
Attention Button Present
0 = Attention Button is not implemented
0
1
2
3
✔
✔
✔
✔
1 = Attention Button is implemented on the slot chassis of the corresponding
PEX 8532 downstream port
Do not change for upstream port.
Power Controller Present
0 = Power Controller is not implemented
1 = Power Controller is implemented for the slot of the corresponding PEX 8532
downstream port
7Ch
Do not change for upstream port.
MRL Sensor Present
0 = MRL Sensor is not implemented
1 = MRL Sensor is implemented on the slot chassis of the corresponding PEX 8532
downstream port
Do not change for upstream port.
Attention Indicator Present
0 = Attention Indicator is not implemented
1 = Attention Indicator is implemented on the slot chassis of the corresponding
PEX 8532 downstream port
Do not change for upstream port.
c. The port receiver must be capable of entering the L0s state, regardless of whether the state is disabled.
140
ExpressLane PEX 8532AA/BA/BB/BC 8-Port/32-Lane Versatile PCI Express Switch Data Book
Copyright © 2007 by PLX Technology, Inc. All Rights Reserved – Version 1.6
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